"When the research progresses to a stage when the information coming from mice and rats is not sufficient, we may move up to using monkeys.

VOA: standard.2010.02.16

Most of these are shared among humans as well as mice, rats and other mammals used for comparison in the study.

VOA: special.2009.05.05

Non-native animals like rats, cats and mongooses kill flightless birds and raid nests.

VOA: special.2009.05.12

President Theodore Roosevelt's family had a pony,a sheep,a bird,guinea pigs,dogs,cats,rats and a snake.

VOA: special.2009.02.23

It was a terrible slum -- as such places are called -- where too many are crowded together, where the houses and streets are dirty and full of rats.

VOA: special.2010.08.01

And laboratory rats increased at a three-percent rate.

VOA: special.2010.12.21

Some people caught rats and ate them.

VOA: special.2009.11.19